[WRONG BRANCH] fix(claude): withhold ambiguous bare context windows

[luvs01]

Motivation

• A mismatch in buildClaudeContextWindows allowed rows that were skipped for registration (missing/zero window or Anthropic <1M) to be ignored when deciding whether a bare model ID was ambiguous, which could cause a bare selector to be marked [1m] even though routing might resolve it to a different provider.

Description

• Change buildClaudeContextWindows to count ambiguity over every routedModels row (not just the registrable subset) so any provider that can route the bare id vetoes automatic bare-key registration.
• Preserve the registrable set for writing provider-qualified context-window entries and the desktop/native alias registration logic.
• Update the tests in tests/claude-context-windows.test.ts to assert that bare aliases are withheld when another provider could route the same id even if that provider did not register a positive window, and to verify provider-qualified keys remain present.

Testing

• Ran the focused test file with ./node_modules/.bin/bun test tests/claude-context-windows.test.ts, which passed (16 tests, 0 failures).
• Typecheck with ./node_modules/.bin/bun run typecheck passed and ./node_modules/.bin/bun run privacy:scan passed.
• Attempted the repository-wide ./node_modules/.bin/bun run test but stopped after uncovering unrelated, environment-sensitive failures/timeouts; the change is covered by the focused regression test and the typecheck/privacy scan results.

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[github-actions]

✅ Deterministic PR hygiene checks passed.

[github-actions]

⏳ DRAFT

• wrong target branch (main); retarget to dev.

What to do

• Retarget this PR to dev — all contributions go to dev.

Its title has been prefixed with [WRONG BRANCH].
This pull request was already a draft. Its draft status will be preserved after every issue above is resolved.